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Return to â20 Questionsâ page. A serious koi pond should be at least 3 feet deep and no areas should be shallower than 2 feet. Any areas shallower than 2 feet is an open invitation to dinner for both blue herons and raccoons.If you donât think you have predators in your neighborhood just build a shallow pond and watch what happens! serious koi pond should be at least 3 feet deep and no areas should be shallower than 2 feet. Any areas shallower than 2 feet is an open invitation to dinner for both blue herons and raccoons. If you donât think you have predators in your neighborhood just build a shallow pond and watch what happens!
If the triangle is 300 feet at the base and 500 feet high, the equation would be: (300 feet x 500 feet)/2 = 75,000 square feet 75,000/43,560 = 1.72 acres Calculating Average Depth. Make a series of soundings by dropping a weighted line to the bottom in straight rows across the pond 30 to 50 feet apart. Add the depth measurements together and divide by the number of soundings. Begin and end each row with the zero measurement at the shoreline and include these in the total number of soundings made.